English

interplane

From inter- + plane.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *pleh₂- ‘flat’

Proto-Indo-European *pl̥h₂nós

Proto-Italic *plānos

Latin plānus ‘plain’

Latin plānum ‘flat surface’

English plane

Today it means

adj Between planes.

Language periods are conventional ranges, not dates for this word.

Etymograph / interplane